James w



4 UNITED STATES PATENT OFFICE.

JAMES W. BONTA, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE AMERICAN NATIONAL TELEPHONE COMPANY, OF NE\V YORK.

TELEPHONE-TRANSMITTER.

$PECIPICATION forming part of Letters Patent No. 364.475, dated June 7, 1887.

Application filed October 521, 1886. Serial No. illdfiilil. (No model.)

To aZZ whom it may concern.-

Be it-known that I, JAMES W.-BONTA, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and 5 State of Pennsylvania, have invented certain new and useful Improvements in Telephonic Transmitters, of which the following is aspecification.

My invention has relation, generally, to the form of telephonic transmitters shown and described in United States Letters Patent No. 333,816, dated the 5th day of January, 1886, and particularly to the form of same having a diaphragm-electrode contacting with a loose or rolling electrode upon an inclined plate or block, the inclination of which is varied by a wedge and thereby varying the initial or normal contact between the electrodes; and it has for its object simplicity in the construction of parts. I

My invention, accordingly, consists in the combination, construction, and arrangement of parts, as hereinafter described and claimed. Reference being had to the accompanying 2 drawings, which illustrate telephonic transmitters embodying my improvements, Figure 1 is a vertical section. Fig. 2 is a rear view, partly sectional, of inclined table or block, wedge, and standards or supports for the wedge;

1 and Figs. 3 and 4: show different arrangement of supporting pins or bars affixed to inclined block.

A represents any suitable form of 130K or casing having a hinged door'or removable side,

5 a, provided with a mouth-piece, a, diaphragm B, suitably provided with an electrode, b, and

two standards or brackets, O, vertically located parallel to one another, as more plainly shown in Fig. 2. In the adjacent sides of 0 these brackets O are formed wedge shaped slots 0, having close front ends, 0, and open rear end, 0. In or adjacent to the front ends,

0', rest the lugs or pins (1, projecting laterally from a block or plate, D, the lower rear end 5 or edge of which rests upon awedge, E,which enters and slides in slots 0. The taper or size of the wedge is such, relatively to that of slots either direction in the slots.

The block D may be of metal or, preferably, 0 of carbon, having a groove, d, for the reception of a loose or rolling electrode, F, which, as shown, is a ball but any other form of loose or rolling electrode may be substituted.

As the lugs or pins d of block D rest against 5 5 the closed ends of slots c,aud the rear edge of the block only impinges upon wedge E, a movement of the latter to or from the diaphragm alters the inclination of or tilts the block D, and thereby varies the initial contact-pressure between the electrodes b and F. The electrodes may be of carbon or other suit able material, and the upper surface of the wedge may be straight or otherwise suitably configured, as desired.

The electrode 1) may be dispensed with when diaphragm B is a carbon plate; and the ball or electrode F then contacts directly with the diaphragm.

The worlring parts of the transmitter are shown at'fixed to and moving with the door, and I prefer this construction as the loose or rolling electrode is maintained in position when the door is opened to obtain access to the interior of the box for purposes of repair 7 5 or adjustment; but itis obvious that the foregoing described arrangement may be varied without departing from the spirit of my invention.

The electrodes 1) F and preferably'plate or block D are in the primary 1 of an inductorium, I, which includes a battery, 3, and the secondary, 4, of which is part of the line.

If desired, a loose or rolling weight or ballast may be placed to the rear of electrode F, 8 5 as indicated at h, Fig. 1.

WW] at I claim is-- 1. In a telephonic transmitter, the combination of a diaphragm, standards 0 G, having wedge-shaped slots 0, closed at their forward 0 ends, plate D, having side lugs, cl, entering the closed ends of slots 0, electrode F, and wedge E, substantially as set forth.

2. In a telephonic transmitter, the combination of door (I, having diaphragm B, and standards 0, having wedge-shaped slots 0, with closed forward ends, 0, block D, having side lugs, (1, adapted to theends 0 of said slots, and wedge E, impinging against the lower rear edge of block D, substantially as [0 lower rear edge of block D, substantially as set forth.

set forth. In testimonywhereof I aiiix my signature in 3. Ina telephonic transmitter, the eornbipresence of two witnesses. 5 nation of door a, diaphragm 13, standards 0 JAMES V BONTA O, a block, D, having lugs or pins (2, loosely supported in said standards, electrode F on Witnesses: i

said block, and a sliding wedge supported on S. J. VAN STAVGREN, said standards and impinging against the J. DANIEL EBY. 

